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Bet it's been running with the check engine light on for awhile. Scan the car for the reason the check engine light is on. Coolant senser saying it's colder thatn it really is and an oxagen senser grounded will both do this. No oil in the engine or water in the oil will do it too.
locate the transmission dipstick on the right or left side of the engine, toward the rear of the engine. it is similar to the oil dipstick, which is probably marked "engine oil" anyway. make sure the engine is hot and running. take the dipstick out and wipe it clean. notice the hash marks and writing inscribed on the stick. the level should be between the hash mark area for the "hot" marks. if it is low, but visible on the stick, add a 1/2 pint to a pint at a time. DON'T OVERFILL. use the correct trans fluid. probably MERCON V, the trans fluid type might be marked on the stick. it's also in the owners manual.
if you have a manual trans, you'll have to get under the vehicle and remove the fill plug located on the left side upper part of the trans. it has a fairly large head and should be easy to spot. use your finger to check the level. it should be 1/2 inch from the top of the hole.
Check engine light with no codes usually means a PCM reset is happening. EBP shorting, ICP shorting, aftermarket "performance chip". PIDS need to be monitored to eliminate sensors. IDMs (Injector Driver Modules) can also cause this. IDM's are separate from the PCM/ECM (engine computer).